Posted by DanO on November 25, 2002 at 07:50:38:
In Reply to: Internal Helical Gear posted by James on November 24, 2002 at 16:40:19:
Internal helical gears use the same equations as external helical gearing. If you use the equation PD=N/P for the pitch diameter of the gear(N=number of teeth, P=transverse diametral pitch or 25.4/transverse module), you use (N+2.1)/P for the (inside)outer-more diameter. Internal gearing must consider several kinds of interference in manufacture and assembly however, first involute interference, second tip interference, and third fillet interference. A fourth issue with an internal is ability to assemble, where some small number of teeth pinion and gear sets may need to be assembled by sliding axially, which is not always acceptable.
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